The legendary rock band's intimate (and sort-of-surprise) performance brought a slew of A-listers to the Troubadour in Los Angeles, including Limitless actor Bradley Cooper, who took his mother, Gloria Campano, as his plus one.

Photo: Splash News

Kate Hudson was there, too, stepping out in her edgiest gear. Just check out those sky-high leopard-print platforms!

Photo: Splash News

During the sold-out show, the Rock the Kasbah actress took to Snapchat to share highlights, making all of us at home insanely jealous that we weren't there to see lead singer Axl Rose and guitarist Slash perform hits like "Paradise City," "Sweet Child O' Mine" and "Welcome to the Jungle" in person.

"I had so much fun last night 'cause I went and saw Guns N' Roses," Hudson excitedly exclaimed in a country accent in a Snapchat posted the following morning. "I cant hear s**t out of this ear now though. It's dead."

Photo: Snapchat

In addition to Cooper and Hudson, Chris Brown, Jim Carrey, Emily Ratajkowski, Nicholas Cage and David Arquette were all spotted in the star-studded crowd.

Cameras and recording devices were reportedly banned from the venue, but that didn't stop some lucky fans from sneaking photos and videos, which they later shared on social media.

The band is currently gearing up for their headlining set at the 2016 Coachella Valley Music and Arts Annual Festival in Indio, California, later this month. After that two-weekend gig, they'll hit the road for their "Not In This Lifetime" stadium tour, which kicks off June 23rd in Detroit and runs through August.

Surprise gigs have become quite the trend for bands and artists as of late. In February, Adele also put on a last minute gig in Los Angeles, performing a pre-GRAMMYs set at the The Wiltern, with stars like Katy Perry, Orlando Bloom, Tom Hanks and John Mayer all in attendance.